Hydro power calculator



FIG. 1 is a front elevational view thereof;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is front perspective view thereof.

The phantom lines shown in the Figures are illustrative of environmental structure only and form no part of the claimed design. 

The ornamental design for a hydro power calculator, as shown and described. 